Power drive system for fracturing pump

ABSTRACT

The present invention discloses a power drive system for a fracturing pump, the power drive system for the fracturing pump is driven by a turbine engine, which can use 100% natural gas as a fuel to replace the diesel consumption in diesel engine drive, lowering fuel costs for customers; the turbine engine itself has the advantages of small volume and light weight, greatly decreasing the volume and weight of the power drive system for the fracturing pump; the turbine engine is directly connected to an input end of the reduction gearbox of the fracturing pump, thus simplifying the transmission device between the fracturing pump and the turbine engine, that is, a transmission shaft or a coupling is omitted, greatly shortening the total length of the power drive system for the fracturing pump; in the present invention, the turbine engine is used as the power source, the transmission device is the reduction gearbox equipped on the fracturing pump itself, and the fracturing pump is the actuating element, so that the power drive system for the fracturing pump has a simple structure and is easy for maintenance.

TECHNICAL FIELD

The present invention relates to the field of operation in oil and gas fields, and specifically to a power drive system for a fracturing pump.

BACKGROUND

In the working sites of fracturing in oil and gas fields all over the world, the driving modes for fracturing equipment mainly include the following two ways:

One driving mode is diesel engine driven, specifically a diesel engine is connected to a transmission through a transmission shaft to drive the fracturing plunger pump to work. In other words, a diesel engine is used as the power source, a transmission and a transmission shaft are used as the transmission devices, and a fracturing plunger pump is used as the actuating element.

This configuration mode has the following disadvantages:

(1) Large volume and heavy weight: When a diesel engine drives a transmission to drive a fracturing plunger pump through a transmission shaft, a large volume is occupied, a heavy weight is involved, the transportation is restricted, and the power density is low;

(2) Environmental problems: During operations on a well site, the fracturing equipment driven by the diesel engine would generate engine waste gas pollution and noise pollution. The noise exceeding 105 dBA will severely affect the normal life of nearby residents;

(3) Cost inefficiency: The fracturing equipment driven by the diesel engine requires relatively high initial purchase costs and incurs high fuel consumption costs for unit power during operation, and the engine and the transmission also require very high routine maintenance costs.

The other driving mode is electric drive fracturing, specifically an electric motor is connected to a transmission shaft or a coupling to drive the fracturing plunger pump to work. In other words, an electric motor is used as the power source, a transmission shaft or a coupling is used as the transmission device, and a fracturing plunger pump is used as the actuating element.

Although the electric drive fracturing has many advantages itself, the power supply on fracturing well sites is the prerequisite for implementation of electric drive fracturing. Generally, it is difficult to supply power for the fracturing well sites in that the power capacity on the well sites is too small to drive the whole fracturing unit, or there are not any power networks at all on the well sites. Therefore, in common electric drive fracturing sites, generators are generally used to generate electricity. The most economical generation fuel is natural gas, but the users employing natural gas need to rent or purchase gas generator sets. For a fracturing well site without power networks, the power of the gas generator sets needs up to at least 30 MW. Purchasing such high-power gas generator sets is a great investment for customers. More importantly, in actual work progress, the accidental shutdown of the gas generator sets would cause the breakdown of the whole electric drive fracturing unit, thus seriously affecting the working quality, even causing work accidents possibly.

Therefore, there is an urgent need for a power drive system for the fracturing equipment with a small volume, a low investment cost and a simpler structure.

SUMMARY

To overcome the deficiencies in the prior art, an objective of the present invention is to provide a power drive system for a fracturing pump, the power drive system for the fracturing pump is driven by a turbine engine, which can use 100% natural gas as a fuel to replace the diesel consumption in diesel engine drive, lowering fuel costs for customers; the turbine engine itself has the advantages of small volume and light weight, greatly decreasing the volume and weight of the power drive system for the fracturing pump; the turbine engine is directly connected to an input end of the reduction gearbox of the fracturing pump, thus simplifying the transmission device between the fracturing pump and the turbine engine, that is, a transmission shaft or a coupling is omitted, greatly shortening the total length of the power drive system for the fracturing pump; in the present invention, the turbine engine is used as the power source, the transmission device is the reduction gearbox equipped on the fracturing pump itself, and the fracturing pump is the actuating element, so that the power drive system for the fracturing pump has a simple structure and is easy for maintenance.

The objective of the present invention is achieved by the following technical measures: a power drive system for a fracturing pump, including a turbine engine, an exhaust system and a fracturing pump, wherein one end of the turbine engine is connected to the exhaust system, the other end of the turbine engine is connected to the fracturing pump; the fracturing pump is a fracturing pump equipped with a reduction gearbox itself, the turbine engine is directly connected to an input end of the reduction gearbox on the fracturing pump.

Further, an input speed of the reduction gearbox of the fracturing pump matches an output speed of the turbine engine, and an input torque of the reduction gearbox of the fracturing pump matches an output torque of the turbine engine.

Further, the fracturing pump, the turbine engine and the exhaust system are disposed in a straight line along the transmission direction of power.

Further, the exhaust system includes an exhaust duct and an exhaust silencer, one end of the exhaust duct is connected to the exhaust silencer, and the other end of the exhaust duct is connected to an exhaust port of the turbine engine.

Further, the fracturing pump, the turbine engine, the exhaust duct and the exhaust silencer are disposed in a straight line along the transmission direction of power.

Compared with the prior art, the present invention has the following beneficial effects: 1. The power drive system for a fracturing pump is driven by a turbine engine, which can use 100% natural gas as a fuel to replace the diesel consumption in diesel engine drive, lowering fuel costs for customers. 2. The turbine engine itself has the advantages of small volume and light weight, greatly decreasing the volume and weight of the power drive system for the fracturing pump. 3. The turbine engine is directly connected to an input end of the reduction gearbox of the fracturing pump, so that an input speed of the reduction gearbox of the fracturing pump matches an output speed of the turbine engine, and an input torque of the reduction gearbox of the fracturing pump matches an output torque of the turbine engine, thus simplifying the transmission device between the fracturing pump and the turbine engine, that is, a transmission shaft or a coupling is omitted, greatly shortening the total length of the power drive system for the fracturing pump. 4. In the present invention, the turbine engine is used as the power source, the transmission device is the reduction gearbox equipped on the fracturing pump itself, and the fracturing pump is the actuating element, so that the power drive system for the fracturing pump has a simple structure and is easy for maintenance. 5. The fracturing pump, the turbine engine and the exhaust system are disposed in a straight line along the transmission direction of power, to ensure the efficient transmission performance of the equipment itself.

The present invention will be described in detail below with reference to the accompanying drawings and specific implementations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a power drive system for a fracturing pump of the invention.

Wherein, 1. turbine engine, 2. reduction gearbox, 3. fracturing pump, 4. exhaust duct, 5. exhaust silencer.

DESCRIPTION OF THE EMBODIMENTS

As shown in FIG. 1, a power drive system for a fracturing pump, including a turbine engine 1, an exhaust system and a fracturing pump 3, wherein one end of the turbine engine 1 is connected to the exhaust system, the other end of the turbine engine 1 is connected to the fracturing pump 3; the fracturing pump 3 is a fracturing pump 3 equipped with a reduction gearbox 2 itself, the turbine engine 1 is directly connected to an input end of the reduction gearbox 2 on the fracturing pump 3. The power drive system for the fracturing pump is driven by a turbine engine 1, which can use 100% natural gas as a fuel to replace the diesel consumption in diesel engine drive, lowering fuel costs for customers; the turbine engine 1 itself has the advantages of small volume and light weight, greatly decreasing the volume and weight of the power drive system for the fracturing pump.

The turbine engine 1 is directly connected to an input end of the reduction gearbox 2 on the fracturing pump 3, so that an input speed of the reduction gearbox 2 of the fracturing pump 3 matches an output speed of the turbine engine 1, and an input torque of the reduction gearbox 2 of the fracturing pump 3 matches an output torque of the turbine engine 1, thus simplifying the transmission device between the fracturing pump 3 and the turbine engine 1, that is, a transmission shaft or a coupling is omitted, greatly shortening the total length of the power drive system for the fracturing pump. In the present invention, the turbine engine 1 is used as the power source, the transmission device is the reduction gearbox 2 equipped on the fracturing pump 3 itself, and the fracturing pump 3 is the actuating element, so that the power drive system for the fracturing pump has a simple structure and is easy for maintenance.

The fracturing pump 3, the turbine engine 1 and the exhaust system are disposed in a straight line along the transmission direction of power.

The exhaust system includes an exhaust duct 4 and an exhaust silencer 5, one end of the exhaust duct 4 is connected to the exhaust silencer, and the other end of the exhaust duct 4 is connected to an exhaust port of the turbine engine 1.

The fracturing pump 3, the turbine engine 1, the exhaust duct 4 and the exhaust silencer 5 are disposed in a straight line along the transmission direction of power, to avoid excessive transmission loss, thus ensuring the efficient transmission performance of the equipment.

It will be appreciated to persons skilled in the art that the present invention is not limited to the foregoing embodiments, which together with the context described in the specification are only used to illustrate the principle of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. All these changes and improvements shall fall within the protection scope of the present invention. The protection scope of the present invention is defined by the appended claims and equivalents thereof. 

1. A power drive system for a fracturing pump, comprising a turbine engine, an exhaust system, a reduction gearbox and a fracturing pump, wherein the turbine engine and the fracturing pump are connected at two sides of the reduction gearbox respectively, one end of the turbine engine is directly connected to an input end of the reduction gearbox, and the other end of the turbine engine is connected to the exhaust system; wherein an input speed of the reduction gearbox of the fracturing pump matches an output speed of the turbine engine, and an input torque of the reduction gearbox of the fracturing pump matches an output torque of the turbine engine.
 2. (canceled)
 3. The power drive system for the fracturing pump according to claim 1, wherein the fracturing pump, reduction gearbox, the turbine engine and the exhaust system are successively connected.
 4. The power drive system for the fracturing pump according to claim 3, wherein the exhaust system comprises an exhaust duct and an exhaust silencer, one end of the exhaust duct is connected to the exhaust silencer, and the other end of the exhaust duct is connected to an exhaust port of the turbine engine.
 5. The power drive system for the fracturing pump according to claim 4, wherein the fracturing pump, the turbine engine, the exhaust duct and the exhaust silencer are successively connected. 